Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 115,549	$ 141,216	$ 107,416
Other comprehensive (loss) income (See Note 14):
Foreign currency translation adjustments, net of tax	(20,718)	(7,893)	1,924
Changes in value of available-for-sale securities, net of tax	0	108	521
Other comprehensive (loss) income, net of tax	(20,718)	(7,785)	2,445
Comprehensive income	94,831	133,431	109,861
Comprehensive (loss) income attributable to non-controlling interests	(374)	266	(10)
Comprehensive income attributable to MasTec, Inc.	$ 95,205	$ 133,165	$ 109,871